PROBLEM TO BE SOLVED : the owner of the property, real estate agents, 3 each tenant user of contents of real estate, easily sedementation, and, clearly estate property for guiding a storage medium. SOLUTION : use of a property of a customer (lessee) belonging to the common inlet and the periphery of the building, and use of various equipment of the entrance door, respective parts of the environment of the building, respectively, each explanation of any character or moving image with a music sound by the explanation of each part and stored in the time series to reproduce the DVD2. Selected drawing : fig. 1